Run your application on an iOS device or simulator.
Confirm that when you display the map you see map detail.
If you only see a beige screen it's possible that your API key is incorrect. When your API
key is incorrect you'll see messages like this in the console:

Common API Key problems for iOS

Your Bundle ID does not match what is registered in the Google API Console.
When you create an restricted API key in the Google API console it asks you to specify your iOS bundle ID.
Make sure that your iOS Bundle Identifier matches the one you registered in the console.

Using the wrong key. If you made a separate key for iOS and Android,
make sure you are using the iOS key in the MapView.setApiKey() call.

Android

You will be making multiple edits to your AndroidManifest.xml file. In your Flutter project, you can
find this file location under android/app/src/main

In your AndroidManifest.xml, add the following uses-permission above the tag.

Run your application on an Android device or simulator.
Confirm that when you display the map you see map detail.
If you only see a beige screen it's possible that your API key is incorrect.

Static Maps for Inline display

This plugin does not currently support displaying a Google Map within the
Flutter widget hierarchy. A common workaround for this is to show a static image using the
Google Static Maps API.
Included in this Plugin is the StaticMapProvider class which will allow you to easily generate
a static map. The Static Maps API also requires an API Key and you must enable the API within the Google API Console.